In order to provide a theoretical foundation for the utilization of tailings as supplementary cementitious materials, the pozzolanic activity of muscovite—a typical mineral phase in tailings—before and after mechanical activation was investigated. In this study, significant pozzolanic activity of muscovite was obtained as a result of the structural and morphological changes that were induced by mechanical activation. The activated muscovite that was obtained after mechanical activation for 160 min satisfies the requirements for use as an active supplementary cementitious material, and the main characteristics of the pozzolana were as follows: median particle size (D50) of 11.7 μm, BET specific surface area of 28.82 m2 g−1, relative crystallinity of 14.99%, and pozzolanic activity index of 94.36%. Continuous grinding led to a gradual reduction in the relative crystallinity and an increase in the pozzolanic activity index due to the dehydroxylation reaction induced by mechanical activation, which occurred despite the fact that the specific surface area showed a decreasing trend when the grinding time was prolonged. Mechanically activated muscovite exhibited the capacity to react with calcium hydroxide to form calcium silicate hydrate, which is a typical characteristic of pozzolana. This experimental study provided a theoretical basis for evaluating the pozzolanic activity of muscovite using mechanical activation.

中文翻译：

---

机械活化对白云母火山灰活性的影响

为了为尾矿作为补充胶凝材料的利用提供理论基础，研究了机械活化前后白云母（尾矿中的典型矿物相）的火山灰活性。在这项研究中，由于机械活化引起的结构和形态变化，白云母具有显着的火山灰活性。机械活化160 min后得到的活化白云母满足作为活性补充胶凝材料使用的要求，火山灰的主要特性如下：中值粒径（D50）为11.7 μm，BET比表面积为28.82 m2 g-1，相对结晶度为 14.99%，火山灰活性指数为 94.36%。由于机械活化引起的脱羟基反应，连续研磨导致相对结晶度逐渐降低和火山灰活性指数增加，尽管随着研磨时间的延长，比表面积呈下降趋势，但仍会发生这种情况。机械活化的白云母表现出与氢氧化钙反应形成硅酸钙水合物的能力，这是火山灰的典型特征。该实验研究为使用机械活化评估白云母的火山灰活性提供了理论基础。尽管随着研磨时间的延长，比表面积呈下降趋势，但仍会发生这种情况。机械活化的白云母表现出与氢氧化钙反应形成硅酸钙水合物的能力，这是火山灰的典型特征。该实验研究为使用机械活化评估白云母的火山灰活性提供了理论基础。尽管随着研磨时间的延长，比表面积呈下降趋势，但仍会发生这种情况。机械活化的白云母表现出与氢氧化钙反应形成硅酸钙水合物的能力，这是火山灰的典型特征。该实验研究为使用机械活化评估白云母的火山灰活性提供了理论基础。